CN216351572U - Vehicle-mounted head-up display - Google Patents
Vehicle-mounted head-up display Download PDFInfo
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- CN216351572U CN216351572U CN202123219543.7U CN202123219543U CN216351572U CN 216351572 U CN216351572 U CN 216351572U CN 202123219543 U CN202123219543 U CN 202123219543U CN 216351572 U CN216351572 U CN 216351572U
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Abstract
The utility model provides a vehicle-mounted head-up display which is used for projecting light rays onto a windshield and comprises a display source and a reflecting membrane, wherein the light rays emitted by the display source are projected onto the windshield after passing through the reflecting membrane; in the case where natural light is incident on the reflection film through the windshield, part of the natural light is transmitted by the reflection film, and the rest of the natural light is reflected by the reflection film. Because the reflecting film reflects or transmits the input natural light, only part of the light enters the display source finally, and the problem that the display source is easy to overheat and damage due to the fact that sunlight flows backwards is solved.
Description
Technical Field
The utility model relates to the technical field of display, in particular to a vehicle-mounted head-up display.
Background
Head-up displays (HUDs), originally applied to flying fighters, are now gradually entering the automotive industry. HUD projects important driving information such as speed per hour, navigation on the preceding windshield of driver or formation of image window through reflective optical system, lets the driver accomplish not bow, do not turn round just can see the virtual image including important driving information such as speed per hour, navigation. In the case of normal driving, the imaging distance of the image is generally not adjustable, which often causes the imaging position of the image on the windshield to be inconsistent with the position where the eyes of the driver focus, for example, when the driver looks at a distant road, the image formed by the HUD needs to be observed from the distant road to the near road, which causes a vergence conflict, and may cause the driver to have adverse conditions such as fatigue and nausea.
In addition, driving the in-process, sunshine often can see through HUD's reflection element and assemble the display source, and the display source can cause the damage because the high temperature that sunshine flows backward, influences HUD's life, can threaten even and drive safety. The existing head-up display achieves the effect of diffusing sunlight entering a display source by adding a diffusion film in front of the display source, so that the heat entering the display source is reduced, but the final imaging brightness and the contrast are reduced.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the embodiment of the utility model is as follows: the head-up display in the related art is easy to cause the damage of the display source due to the overheating caused by the reverse flow of sunlight.
In order to solve the technical problem, the embodiment of the utility model adopts the following technical scheme:
the embodiment of the utility model provides a vehicle-mounted head-up display, which is used for projecting light rays onto a windshield, and comprises a display source and a reflecting membrane, wherein the light rays emitted by the display source are projected onto the windshield after passing through the reflecting membrane; in the case where natural light is incident on the reflection film through the windshield, part of the natural light is transmitted by the reflection film, and the rest of the natural light is reflected by the reflection film.
Further, the vehicle-mounted head-up display further comprises a polarizer and a geometric phase device, wherein the polarizer is arranged on the light path between the display source and the reflection diaphragm, and the geometric phase device is arranged on the light path between the polarizer and the reflection diaphragm; and the rest of the natural light is focused or diffused by the geometric phase device and then emitted to the polarizer, part of the natural light focused or diffused by the geometric phase device is transmitted by the polarizer, and the rest of the natural light focused or diffused by the geometric phase device is reflected by the polarizer.
Further, the polarizer is a left-handed circular polarizer, the geometric phase device has a positive side and a negative side disposed opposite to the positive side, and the positive side of the geometric phase device faces the polarizer; the reflection membrane is a liquid crystal membrane with chiral agent and right-handed chiral agent.
Further, the polarizer is a right-handed circular polarizer, the geometric phase device has a positive side and a negative side opposite to the positive side, and the negative side of the geometric phase device faces the polarizer; the reflection membrane is a liquid crystal membrane with chiral agent rotation of left-handed rotation.
Further, the polarizer is a left-handed circular polarizer, the geometric phase device has a positive side and a negative side disposed opposite to the positive side, and the negative side of the geometric phase device faces the polarizer; the reflection membrane is a liquid crystal membrane with chiral agent and right-handed chiral agent.
Further, the polarizer is a right-handed circular polarizer, the geometric phase device has a positive side and a negative side opposite to the positive side, and the positive side of the geometric phase device faces the polarizer; the reflection membrane is a liquid crystal membrane with chiral agent rotation of left-handed rotation.
Further, the vehicle-mounted head-up display further comprises a focal length adjustable lens, and the focal length adjustable lens is arranged on a light path between the display source and the windshield.
Further, the vehicle-mounted head-up display further comprises a curved surface reflector, and the curved surface reflector is arranged on a light path between the reflecting membrane and the windshield.
Further, the focal length adjustable lens is arranged on a light path between the display source and the reflection diaphragm; or the focal length adjustable lens is arranged on a light path between the reflecting membrane and the curved surface reflector; or the focal length adjustable lens is arranged on a light path between the curved surface reflector and the windshield.
The embodiment of the utility model has the beneficial effects that: the embodiment of the utility model provides a vehicle-mounted head-up display, which is used for projecting light rays onto a windshield and is characterized by comprising a display source and a reflecting membrane, wherein the light rays emitted by the display source are projected onto the windshield after passing through the reflecting membrane; in the case where natural light is incident on the reflection film through the windshield, part of the natural light is transmitted by the reflection film, and the rest of the natural light is reflected by the reflection film. Because the reflecting film reflects or transmits the input natural light, only part of the light enters the display source finally, and the problem that the display source is easy to overheat and damage due to the fact that sunlight flows backwards is solved.
Drawings
The detailed structure of the embodiment of the utility model is described in detail below with reference to the accompanying drawings
Fig. 1 is a schematic optical path diagram of display source light of a vehicle-mounted head-up display according to an embodiment of the present invention;
fig. 2 is a schematic view of a light path of sunlight of the vehicle-mounted head-up display according to the embodiment of the present invention;
FIG. 3 is a schematic view of an embodiment of the present invention;
fig. 4 is a schematic diagram of a vehicle-mounted head-up display according to a first embodiment of the present invention;
fig. 5 is a schematic diagram of a vehicle-mounted head-up display according to a second embodiment of the present invention;
fig. 6 is a schematic diagram of a vehicle-mounted head-up display according to a third embodiment of the present invention;
fig. 7 is a schematic diagram of a vehicle-mounted head-up display according to a fourth embodiment of the present invention;
fig. 8 is a schematic structural diagram of a first example of a vehicle-mounted head-up display according to an embodiment of the utility model;
fig. 9 is a schematic structural diagram of a second example of the vehicle-mounted head-up display according to the embodiment of the utility model;
the display device comprises a windshield 1, a display source 2, a reflection film 3, a polarizer 4, a geometric phase device 5, a positive side 51, a negative side 52, a focal length adjustable lens 6, a curved surface reflector 7, a left-handed circularly polarized light 01, a first-order diffracted light 02, a zero-order diffracted light 03 and a right-handed circularly polarized light 04.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.
Referring to fig. 1 and 2, an embodiment of the utility model provides a vehicle-mounted head-up display, which is used for reflecting light to a windshield 1, and includes a display source 2 and a reflective membrane 3, wherein the light emitted by the display source 2 passes through the reflective membrane 3 and then is projected onto the windshield 1; in the case where natural light is incident on the reflection film 3 through the windshield 1, part of the natural light is transmitted by the reflection film 3, and the rest of the natural light is reflected by the reflection film 3.
In this embodiment, the display source 2 is configured to generate light, the reflection film 3 is configured to reflect or transmit according to a polarization state of the input light, when the natural light enters the display source 2 along the light path, under a condition that the natural light is incident on the reflection film 3 through the windshield 1, a part of the natural light is transmitted by the reflection film 3, the rest of the natural light is reflected by the reflection film 3, and finally only a part of the light enters the display source 2, so as to solve a problem that the display source 2 is damaged due to overheating caused by reverse flow of sunlight.
Further, the vehicle-mounted head-up display further comprises a polarizer 4 and a geometric phase device 5, wherein the polarizer 4 is arranged on the light path between the display source 2 and the reflection diaphragm 3, and the geometric phase device 5 is arranged on the light path between the polarizer 4 and the reflection diaphragm 3; the rest of the natural light is focused or diffused by the geometric phase device 5 and then emitted to the polarizer 4, part of the natural light focused or diffused by the geometric phase device 5 is transmitted by the polarizer 4, and the rest of the natural light focused or diffused by the geometric phase device 5 is reflected by the polarizer 4.
In the embodiment, the polarizer 4 is arranged on the light path between the display source 2 and the reflective membrane 3, and the geometric phase device 5 is arranged on the light path between the polarizer 4 and the reflective membrane 3; the display source 2 is used for generating light and transmitting the light to the polarizer 4; the polarizer 4 is used for changing the polarization state of light rays or natural light generated by the display source 2 and then inputting the light rays or the natural light into the geometric phase device 5; the geometric phase device 5 is used for focusing or diverging according to the polarization state of the light from the polarizer 4 or the natural light input; the reflecting film 3 is used for reflecting or transmitting according to the polarization state of light rays from the geometric phase shifter 5 or natural light input; when natural light enters the display source 2 along a light path, under the condition that the natural light is incident to the reflecting film 3 through the windshield 1, part of the natural light is transmitted by the reflecting film 3, the rest of the natural light is reflected by the reflecting film 3, the rest of the natural light is focused or diffused by the geometric phase device 5 and then is emitted to the polarizer 4, part of the natural light focused or diffused by the geometric phase device 5 is transmitted by the polarizer 4, the rest of the natural light focused or diffused by the geometric phase device 5 is reflected by the polarizer 4, and finally, only a small amount of the natural light enters the display source 2, so that the problem that the display source 2 is easily damaged due to overheating because the sunlight flows backward is solved.
Example one
Further, the polarizer 4 is a left-handed circular polarizer, the geometric phase device 5 has a positive side 51 and a negative side 52 disposed opposite to the positive side 51, the positive side 51 of the geometric phase device 5 faces the polarizer 4; the reflective film 3 is a liquid crystal film whose chiral agent is dextrorotation.
Referring to fig. 1 to 4, in the present embodiment, the Display source 2 is LCOS (Liquid Crystal on Silicon), LCD (Liquid Crystal Display), OLED (Organic Light-Emitting semiconductor), DLP (Digital Light Processing), MICRO-LED (MICRO-Light-Emitting Diode) or MINI-LED (MINI Light-Emitting Diode), and the MICRO-LED is preferred as the Display source 2 because the Display device has better contrast, brightness and power consumption than other Display devices; the polarizer 4 is preferably a left-handed circularly polarizing plate and is used for generating left-handed circularly polarized light; the geometric phase device 5 is a polymer stabilized liquid crystal film, the geometric phase device 5 is divided into a positive side 51 and a negative side 52, polarized light can generate different actions when passing through different sides, and preferably, the positive side 51 of the geometric phase device 5 faces the polarizer 4; because the reflecting film 3 has polarization selectivity, namely, the reflecting film selectively reflects left circularly polarized light and transmits right circularly polarized light, or reflects right circularly polarized light and transmits left circularly polarized light, when the polarization rotation of the incident light is consistent with the rotation of the chiral agent added during the manufacture of the liquid crystal film, the liquid crystal film presents reflection characteristics to the incident light; when the polarization and the handedness of the incident light are opposite to those of the chiral agent added during the manufacture of the liquid crystal membrane, the liquid crystal membrane presents the transmission characteristic to the incident light; therefore, the reflective film 3 is a polymer-stabilized liquid crystal film or a cholesteric liquid crystal film, and preferably a liquid crystal film having a chiral property of a right-handed chiral agent. The circularly polarized light is reflected or transmitted by the reflective film 3, and the circular polarized light has almost no change in polarization.
Specifically, when light exits from the display source 2, passes through the left circularly polarizing plate and becomes left circularly polarized light 01, and the left circularly polarized light 01 enters from the positive side 51 of the geometric phase device 5, the clockwise circularly polarized first order diffracted light 02 converging on the negative side 52 and the counterclockwise circularly polarized zero order diffracted light 03 neither diverging nor converging on the negative side 52 are generated after being modulated by the geometric phase device 5. It should be noted that, regardless of the polarization state of the light, the diffraction efficiency of the first-order diffracted light 02 is controlled to be 90% or more and the diffraction efficiency of the zero-order diffracted light 03 is controlled to be 10% or less, regardless of whether the light is converging or diverging. The first-order diffracted light 02 emitted by the geometric phase device 5 reaches the reflecting film 3, is reflected to the windshield 1, and finally is reflected to human eyes to finally form a virtual image. And the zero-order diffracted light is finally transmitted out of the reflecting membrane 3 and does not participate in imaging. For sunlight or ambient light, the sunlight will enter the display source 2 along the original optical path due to the principle that the optical path is reversible. In the embodiment, when sunlight is incident to the reflective film 3 through the windshield 1, the reflective film 3 has wavelength selectivity, that is, when the wavelength of the incident light and the wavelength of the reflective film 3 satisfy a reflection matching condition, the incident light is reflected; when the matching condition is not met, the incident light can penetrate through the reflecting film 3, so that only part of right-handed circularly polarized light with matched wavelength can be reflected to enter the geometric phase device 5, the polarizer 4 and the display source 2, the right-handed circularly polarized light generates convergent left-handed circularly polarized first-order diffracted light 02 and non-convergent and non-divergent right-handed circularly polarized zero-order diffracted light 03 when passing through the geometric phase device 5, and finally only the first-order diffracted light 02 can enter the display source 2 through the left-handed circularly polarizing plate. Thus, the structure reduces the back flow of sunlight by at least 55% compared to the head-up display of the conventional structure.
Example two
Further, the polarizer 4 is a right-handed circular polarizer, the geometric phase device 5 has a positive side 51 and a negative side 52 disposed opposite to the positive side 51, the negative side 52 of the geometric phase device 5 faces the polarizer 4; the reflection film 3 is a liquid crystal film of which chiral agent is levorotatory.
Referring to fig. 5, different from the first embodiment, when the polarizer 4 in the present embodiment is a right-handed circularly polarizing plate, the negative side 52 of the geometric phase device 5 faces the polarizer 4, and the reflective film 3 is a liquid crystal film with a chiral agent of left-handed rotation, when right-handed circularly polarized light 04 is incident from the negative side 52, the first-order diffracted light 02 of the convergent left-handed circular polarization and the zero-order diffracted light 03 of the right-handed circular polarization that neither converges nor diverges are generated on the positive side 51 after being modulated by the geometric phase device 5. Similar to the embodiment, for the light emitted from the display source 2, only the first-order diffracted light 02 finally participates in imaging reflection and enters the human eye; while for sunlight, again only the first order diffracted light 02 enters the display source 2. Compared with a head-up display with a traditional structure, due to the wavelength selectivity and the polarization selectivity of the reflecting film 3, the structure can at least reduce 55% of sunlight backflow, and meanwhile, the acquisition of road information by people cannot be influenced.
EXAMPLE III
Further, the polarizer 4 is a left-handed circular polarizer, the geometric phase device 5 has a positive side 51 and a negative side 52 disposed opposite to the positive side 51, the negative side 52 of the geometric phase device 5 faces the polarizer 4; the reflective film 3 is a liquid crystal film whose chiral agent is dextrorotation.
Referring to fig. 6, different from the first embodiment, the polarizer 4 in the present embodiment is a left-handed circularly polarizing plate, the negative side 52 of the geometric phase device 5 faces the polarizer 4, and the geometric phase device 5 has a certain amplification effect on the incident left-handed circularly polarized light 01, and finally, after passing through the whole system, amplification imaging at different depths can be realized. For sunlight, only part of right-handed circularly polarized light meeting the reflection matching condition can enter the geometric phase device 5, the polarizer 4 and the display source 2, when the right-handed circularly polarized light passes through the geometric phase device 5, first-order diffracted light 02 of divergent left-handed circular polarization and zero-order diffracted light 03 of the right-handed circular polarization which is neither divergent nor convergent are generated, and finally, only the first-order diffracted light 02 can enter the display source 2 through the left-handed circular polarizing plate. Compared with the first embodiment, the light finally entering the display source 2 is in a divergent state, so that the energy is more divergent, and the method is more effective for preventing the sunlight from flowing backwards.
Example four
Further, polarizer 4 is a right-handed circular polarizer, geometric phase device 5 has a positive side 51 and a negative side 52 disposed opposite to positive side 51, positive side 51 of geometric phase device 5 faces polarizer 4; the reflection film 3 is a liquid crystal film of which chiral agent is levorotatory.
Referring to fig. 7, different from the second embodiment, the polarizer 4 in this embodiment is a right-handed circular polarizer, the front side 51 of the geometric phase device 5 faces the polarizer 4, for sunlight, only a part of left-handed circular polarized light meeting the reflection matching condition can enter the geometric phase device 5, the polarizer 4 and the display source 2, when the left-handed circular polarized light passes through the geometric phase device 5, first-order diffracted light 02 of the divergent right-handed circular polarization and zero-order diffracted light 03 of the left-handed circular polarization which is neither divergent nor convergent are generated, and finally, only the first-order diffracted light 02 can enter the display source 2 through the left-handed circular polarizer; similarly, compared to the first embodiment, the light finally entering the display source 2 is in a divergent state, so that the energy is more divergent, and the back flow of sunlight is more effectively prevented.
Further, the vehicle-mounted head-up display further comprises a focal length adjustable lens 6, and the focal length adjustable lens 6 is arranged on a light path between the display source 2 and the windshield 1.
The focal length adjustable lens 6 of the present embodiment is a liquid lens, and is configured to adjust the focal power of input light, change the curvature of the liquid by applying a voltage, and further change the focal length of the lens. Based on the human eye persistence effect and the quick response of the liquid lens, the planar display of at least two different depths can be realized. As shown in fig. 3, adjusting the focal length of the lens in the previous frame of the picture enables the imaging position of the whole system to be located at a, and adjusting the focal length of the lens in the next frame of the picture enables the imaging position of the whole system to be located at b, so that imaging display at different depths is finally realized, and the image can be better attached to the environment, thereby realizing real augmented reality. It should be noted that the focal length adjustable lens 6 does not change the polarization state of the light, that is, the focal length adjustable lens 6 is used to adjust the focal power of the light to achieve that the final virtual image is imaged at different depths, that is, the imaging distance is adjusted.
Further, the vehicle-mounted head-up display further comprises a curved surface reflector 7, and the curved surface reflector is arranged on a light path between the reflecting membrane 3 and the windshield 1.
In this embodiment, the curved surface reflecting mirror 7 is disposed on the light path between the reflective film 3 and the windshield 1, and is configured to adjust the focal power and the reflected light of the light input to the curved surface reflecting mirror 7, and the curved surface reflecting mirror 7 is a free-form surface reflecting mirror, and plays a role in correcting imaging distortion on the windshield 1, amplifying a picture imaged on the windshield 1, and folding the light path.
Further, the focal length adjustable lens 6 is arranged on the light path between the display source 2 and the reflection diaphragm 3; or the focal length adjustable lens 6 is arranged on the light path between the reflecting membrane 3 and the curved surface reflector 7; or the focal length adjustable lens 6 is arranged on the light path between the curved surface reflector 7 and the windshield 1.
Referring to fig. 1, 8 and 9, the focus adjustable lens 6 of the present embodiment does not have much influence on the imaging effect at different positions, and has a certain influence on the volume of the whole head-up display. Preferably, the focus-adjustable lens 6 is located in the optical path between the display source 2 and the reflective membrane 3, where the overall volume is small.
In conclusion, the vehicle-mounted head-up display provided by the utility model has the advantages that the shooting of human eyes to the environment brightness is not influenced, the image imaging distance is adjustable, the size of an imaging picture is large enough, and the image can be better attached to the environment, so that the real augmented reality is realized. Meanwhile, the problem that the display source is damaged due to overheating caused by backward flowing of sunlight can be solved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A vehicle-mounted head-up display is used for projecting light rays onto a windshield and is characterized by comprising a display source and a reflecting membrane, wherein the light rays emitted by the display source pass through the reflecting membrane and then are projected onto the windshield; in the case where natural light is incident on the reflection film through the windshield, part of the natural light is transmitted by the reflection film, and the rest of the natural light is reflected by the reflection film.
2. The vehicle head-up display of claim 1, wherein: the vehicle-mounted head-up display further comprises a polarizer and a geometric phase device, wherein the polarizer is arranged on a light path between the display source and the reflection diaphragm, and the geometric phase device is arranged on the light path between the polarizer and the reflection diaphragm; and the rest of the natural light is focused or diffused by the geometric phase device and then emitted to the polarizer, part of the natural light focused or diffused by the geometric phase device is transmitted by the polarizer, and the rest of the natural light focused or diffused by the geometric phase device is reflected by the polarizer.
3. The vehicle head-up display of claim 2, wherein: the polarizer is a left-handed circular polarizer, the geometric phase device is provided with a positive side and a negative side opposite to the positive side, and the positive side of the geometric phase device faces the polarizer; the reflection membrane is a liquid crystal membrane with chiral agent and right-handed chiral agent.
4. The vehicle head-up display of claim 2, wherein: the polarizer is a right-handed circular polaroid, the geometric phase device is provided with a positive side and a negative side opposite to the positive side, and the negative side of the geometric phase device faces the polarizer; the reflection membrane is a liquid crystal membrane with chiral agent rotation of left-handed rotation.
5. The vehicle head-up display of claim 2, wherein: the polarizer is a left-handed circular polarizer, the geometric phase device is provided with a positive side and a negative side opposite to the positive side, and the negative side of the geometric phase device faces the polarizer; the reflection membrane is a liquid crystal membrane with chiral agent and right-handed chiral agent.
6. The vehicle head-up display of claim 2, wherein: the polarizer is a right-handed circular polaroid, the geometric phase device is provided with a positive side and a negative side opposite to the positive side, and the positive side of the geometric phase device faces the polarizer; the reflection membrane is a liquid crystal membrane with chiral agent rotation of left-handed rotation.
7. The vehicle head-up display of any one of claims 2-6, wherein: the vehicle-mounted head-up display further comprises a focal length adjustable lens, and the focal length adjustable lens is arranged on a light path between the display source and the windshield.
8. The vehicle head-up display of claim 7, wherein: the vehicle-mounted head-up display further comprises a curved surface reflector, and the curved surface reflector is arranged on a light path between the reflecting membrane and the windshield.
9. The vehicle head-up display of claim 8, wherein: the focal length adjustable lens is arranged on a light path between the display source and the reflecting membrane; or the focal length adjustable lens is arranged on a light path between the reflecting membrane and the curved surface reflector; or the focal length adjustable lens is arranged on a light path between the curved surface reflector and the windshield.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123219543.7U CN216351572U (en) | 2021-12-20 | 2021-12-20 | Vehicle-mounted head-up display |
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| CN202123219543.7U CN216351572U (en) | 2021-12-20 | 2021-12-20 | Vehicle-mounted head-up display |
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